/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.pvm.runtime;

import java.util.List;
import java.util.Map;

import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.pvm.process.ProcessDefinitionImpl;
import org.activiti.engine.impl.pvm.process.ScopeImpl;
import org.flowable.common.engine.api.delegate.event.FlowableEngineEventType;
import org.flowable.common.engine.impl.interceptor.EngineConfigurationConstants;

/**
 * @author Tom Baeyens
 * @author Daniel Meyer
 */
public class AtomicOperationProcessStart extends AbstractEventAtomicOperation {

    @Override
    protected ScopeImpl getScope(InterpretableExecution execution) {
        return execution.getProcessDefinition();
    }

    @Override
    protected String getEventName() {
        return org.activiti.engine.impl.pvm.PvmEvent.EVENTNAME_START;
    }

    @Override
    protected void eventNotificationsCompleted(InterpretableExecution execution) {
        if (Context.getProcessEngineConfiguration() != null && Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
            Map<String, Object> variablesMap = null;
            try {
                variablesMap = execution.getVariables();
            } catch (Throwable t) {
                // In some rare cases getting the execution variables can fail (JPA entity load failure for example)
                // We ignore the exception here, because it's only meant to include variables in the initialized event.
            }
            Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
                    ActivitiEventBuilder.createEntityWithVariablesEvent(FlowableEngineEventType.ENTITY_INITIALIZED,
                            execution, variablesMap, false), EngineConfigurationConstants.KEY_PROCESS_ENGINE_CONFIG);
            Context.getProcessEngineConfiguration().getEventDispatcher()
                    .dispatchEvent(ActivitiEventBuilder.createProcessStartedEvent(execution, variablesMap, false),
                            EngineConfigurationConstants.KEY_PROCESS_ENGINE_CONFIG);
        }

        ProcessDefinitionImpl processDefinition = execution.getProcessDefinition();
        StartingExecution startingExecution = execution.getStartingExecution();
        List<ActivityImpl> initialActivityStack = processDefinition.getInitialActivityStack(startingExecution.getInitial());
        execution.setActivity(initialActivityStack.get(0));
        execution.performOperation(PROCESS_START_INITIAL);
    }
}
